1 to 1 NAT a full Subnet

zapper <(E-Mail Removed)> wrote:

> I want 10.0.0.1 to see subnet 192.168.0.0/24 as 192.168.2.2/24. I want
> to map IPs from one subnet to another:
>
> 192.168.0.1 -> 192.168.2.1
> 192.168.0.2 -> 192.168.2.2
> 192.168.0.3 -> 192.168.2.3
> .....
> and so on

There is a feature for this. I've seen it the latests standard 2.6
kernels. Probably available via patch-o-matic too. It's called netmap

--
Cameron Kerr
(E-Mail Removed) : http://nzgeeks.org/cameron/
Empowered by Perl!

Hi,
This is an old question. But I hope someone must have comeup with a
solution.

Scenario:

(Inner Network) - (Gateway) - (Outernetwork)
192.168.0.1 10.0.0.1


I want 10.0.0.1 to see subnet 192.168.0.0/24 as 192.168.2.2/24. I want
to map IPs from one subnet to another:

192.168.0.1 -> 192.168.2.1
192.168.0.2 -> 192.168.2.2
192.168.0.3 -> 192.168.2.3
......
and so on


I can do this by assigning 192.168.2.0/24 IP addresses to the Gateway
interface on the outernetwork side. In case of this class C example
the Gateway will have 254 virtual interfaces on it. Otherwise the
gateway will not pick up packets addressed to 192.168.2.0/24 network.

This is all fine, but this will become very difficult to handle with
more IPs. Besides I am sure there must be an elegent method to do the
same in Linux.

Any comments on this??

(Please dont tell me to assign 192.168.2.0 IPs to hosts on my inner
lan. Thats not a possibility at this stage)

Well a simple shell script will creat all the interfaces you want
without much work on your part.

Haven't tried it myself, but you should be able to make a chain rule
that rewrites the packet header to change the IP, then just make it the
gateway for the other network, insted of virtual mapping each address.
Just rewrite all packets to fake ip.
Robert

On Wed, 23 Jun 2004 22:38:25 -0700, zapper wrote:

> Hi,
> This is an old question. But I hope someone must have comeup with a
> solution.
>
> Scenario:
>
> (Inner Network) - (Gateway) - (Outernetwork)
> 192.168.0.1 10.0.0.1
>
>
> I want 10.0.0.1 to see subnet 192.168.0.0/24 as 192.168.2.2/24. I want
> to map IPs from one subnet to another:
>
> 192.168.0.1 -> 192.168.2.1
> 192.168.0.2 -> 192.168.2.2
> 192.168.0.3 -> 192.168.2.3
> .....
> and so on
>
>
> I can do this by assigning 192.168.2.0/24 IP addresses to the Gateway
> interface on the outernetwork side. In case of this class C example
> the Gateway will have 254 virtual interfaces on it. Otherwise the
> gateway will not pick up packets addressed to 192.168.2.0/24 network.
>
> This is all fine, but this will become very difficult to handle with
> more IPs. Besides I am sure there must be an elegent method to do the
> same in Linux.
>
> Any comments on this??
>
> (Please dont tell me to assign 192.168.2.0 IPs to hosts on my inner
> lan. Thats not a possibility at this stage)